Portable seat



FIG. 1 is a perspective view of a portable mat showing my new design;

FIG. 2 is a top plan view of the design of FIG. 1;

FIG. 3 is a bottom plan view of the design of FIG. 1;

FIG. 4 is a left side elevational view of the design of FIG. 1, the right side view being the mirror image thereof;

FIG. 5 is a rear elevational view of the design of FIG. 1, and

FIG. 6 is a front elevational view of the design of FIG. 1. 

The ornamental design for a portable seat, as shown and described. 